Pump structure



March 9v 1926.

PUMP STRUCTURE Filed Dec. 9,

- R. C.DAVIS ET AL o o c U 0 a Patented Mar. 9, 1926.

UNITED stares PATENT. OFFICE}.

RICHARD G. DA VIS ANDOLLIA ROBERT MITCHELL, OF FORT EDWARD, NEW YORK.

PUMP STRUCTURE.

Application filed December 9, 1924. Serial No. 754,802.

T 0 all whom itma'y concern. v

Be it known that we, Rronann O. DAVIS and OLLIA ROBERT MITCHELL, citizens of the United States, residing at Fort Edward, in the county of Washington and State of New York, have invented certain new and useful Improvements in Pump Structures, of which the following is a specification.

. This invention relates broadly to an improved pump structure, but it has more particular reference to means for automatically priming a suction or supply pipe, to insure prompt flow of the fluid to obviate the necessity of priming it by hand.

More specifically speaking, a structure of this class is proposed, which embodies an automatically supplied valved by-pass, which is connected with the suction pipe for automatically supplying fluid thereto, for priming and maintaining prime.

The structural features and advantages derived from their use will become apparent from the following description and drawing.

In the accompanying drawing, forming a part of this application, and in which like numerals designate like parts throughout the same:

The figure represents a pump structure, partly in section, and partly in elevation, constructed in accordance with the present invention.

Referring to the drawings in detail, the reference character, 1 designates a supply pipe which descends into the supply and is provided on its bottom with a strainer and valve or its equivalent 2. The pipe may be of any appropriate length. It extends above the surface and the extended end is connected with a casting 3, of special construction. In the present instance, this casting comprises a part 4:, which is de signed to form a suction chamber for the fluid. A central diaphragm or partition 5 isprovided within the casting, and the same divides it into a fluid collecting chamber 6. The diaphragm is fashioned to accommodate a suction controlled valve 7, which when unseated, permits the fluid to flow from the part 4 into the chamber 6. The casting is further fashioned to provide a cylinder 8, which has the head 9 of a plunger 10 reciprocating therein. The cylinder is open on one side, for communication with the aforesaid chamber 6. At the top of the chamber 6, is another diaphragm which is fashioned to provide another valve seat, and a pressure opened valve 11 is arused in the priming operation, and in addition this service tank or an auxiliary tank collects and retains a supply of fluid used in keeping the suction pipe primed.

An upwardly inclined discharge pipe 13 is connected with the dome 12 and extends to any appropriate point of discharge. Under ordinary conditions the fluid in the reservoir 12 and in service or auxiliary tank maintains, under pressure, the supply which keeps the suction pipe automatically primed and the lower portion of discharge pipe 1.3 full. Connected to the discharge pipe 13 at a point below the normal fluid level is a bypass 1 1. This by-pass extends downwardly and is connected at its lower end to the upper portion of the aforesaid suction pipe 1, and it is provided with an appropriate regulating and control valve 15 between its ends. This bypass or means of priming may be attached to or incorporated in the pump structure or discharge pipe, anywhere above the upper or discharge valve, and the other end attached to or incorporated in the pump structure or suction pipe, anywhere below the lower or suction valve of pump.

The operation of the pump is as follows:

On the down stroke of the plunger, fluid is forced from the cylinder 8 into the chamber 6, and from the chamber 6 into the reservoir 12, at which time the valve 11 is forced off its seat. The fluid is then discharged upwardly and through-the discharge pipe 13. On the u stroke or suction stroke of the plunger, t e suction valve 7 is unseated, and fluid is drawn from the pipe 1 into the part 4 and collected in the chamber 6, when the valve 7 seats. The fluid which is stored in the reservoir 12, service or auxiliary tank, serves to automatically maintain fluid in the upper portion of the suction pipe 1, and also in the suction chamber of the pump, through the medium of the valved by-pass 14, thus priming the pipe in an obvious manner.

It is thought that the foregoing descrip tion taken in connection with the accompanying drawing will enable persons skilled in the art to which the invention relates to obtain a clear understanding of the same.

Forthis reason a more lengthy description 1s thoughtunnecessary. r Although We have shown and described the specific and preferred embodiment of; "the invention, it is to be understood that A pump structure of the class described comprising a suction pipe adapted to de pend into a source ofsupply, a body divided signatures.

into valved chambers and connected with the upper end of said suction pipe, said body including a vcylinder, a plunger rociprocable in saidjcylinder for unseating said valves and transferring the fluid from one chamber to another, a fluid trapping reservoir, a discharge pipe connected with said reservoiryand a valved by-pass between said discharge pipe and suction pipe.

In testimony whereof We-have aifixed our Brennan 0. DAVIS. Y 0. ROBERT MITCHELL.- 

